Correcting for contact area changes in nanoindentation using surface acoustic waves

SCRIPTA MATERIALIA

卷:128

Article

Beck, Christian E.¹  Hofmann, Felix²  Eliason, Jeffrey K.^3,4  Maznev, Alexei. A.³  Nelson, Keith A.³  Armstrong, David E. J.¹ 

[1] Univ Oxford, Dept Mat, Parks Rd, Oxford OX1 3PH, England

[2] Univ Oxford, Dept Engn Sci, Parks Rd, Oxford OX1 3PJ, England

[3] MIT, Dept Chem, 77 Massachusetts Ave, Cambridge, MA 02139 USA

[4] Univ Minnesota, Dept Chem Engn & Mat Sci, 421 Washington Ave SE, Minneapolis, MN 55455 USA

关键词: Nanoindentation;    Pile-up;    Ion implantation;    Irradiation;    Surface acoustic waves;   

DOI  :  10.1016/j.scriptamat.2016.09.037

来源: Elsevier

【 摘 要 】

Nanoindentation is extensively used to quantify nano-scale mechanical behaviour. A widely-used assumption is that a well-defined, material-independent relationship exists between the indentation depth and indenter contact area. Here we demonstrate that this assumption is violated by ion-implanted tungsten, where pileup around the indenter tip leads to substantial changes in contact area. Using high accuracy surface acoustic wave measurements of elastic modulus, we are able to correct for this effect. Importantly we demonstrate that a priori knowledge of elastic properties can be readily used to compensate for pileup effects in nanoindentation without the need for any further measurements. (C) 2016 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

Free